MCPF1412M06 datasheet(5/63 Pages) MICROCHIP

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MCPF1412M06

Functional Description

Data Sheet

DS60001885C - 5

Functional Description

2.1.

Overview

The MCPF1412M06 is a user-friendly, fully integrated, and highly efficient DC/DC regulator. Its

operation, including output voltage and system optimization parameters, can be programmed via

the I2C/PMBus™ protocol. It employs a proprietary modulator to ensure rapid transient response.

The modulator features internal compensation, making it suitable for a wide range of applications

with various types of output capacitors, without encountering loop stability issues.

The MCPF1412M06 is a versatile device that offers significant flexibility for configuration and

system monitoring through the I2C/PMBus™ interface. Additionally, it supports standalone operation

without a digital interface, allowing designers to easily configure output voltages using simple

resistor divider adjustments and monitor the system via the Power Good output.

2.2.

Operation and Topology

The MCPF1412M06 employs an interleaved buck converter design, which minimizes voltage stress

on internal power components, leading to a more compact size but with switching losses similar to

those of a conventional interleaved buck converter with the same rating. Additionally, it features an

inherent current-sharing mechanism between the two phases.

2.3.

Bias Voltage

The MCPF1412M06 features an integrated Low Drop-Out (LDO) regulator that supplies the DC bias

voltage for its internal circuitry, typically outputting 5.2V. For single-rail operation with internal bias,

connect the VIN pin to the PVIN pin (see Figure 2-1). When using an external bias voltage, connect

the VIN pin to the VCC pin to bypass the internal LDO regulator (see Figure 2-2). A separate pin

(PVCC) is provided for driver bias and should be connected to VCC in the application circuit. The

supply voltage, whether internal or external, increases with VIN and does not require enabling via

the EN pin. Therefore, I2C/PMBus™ communication can commence once the following conditions are

met:

• The VCC_UVLO start threshold is surpassed

• Memory contents are loaded

• Initialization is complete

• The address offset is read

Attention: During initialization, a small leakage current (approximately 3.4 μA)

may flow from the device to the output, potentially pre-biasing the output voltage

in applications with prolonged VIN/VCC rise times. To mitigate this, connect a

small load capable of sinking 3.4 μA in such applications.

The I2C bus can be pulled up to either VCC or a system I2C bus voltage. The MCPF1412M06 allows

for two I2C bus voltage ranges, selectable via the user register bit Bus_voltage_sel, as shown below:

Bits

Name/ Description

0x7A

[2]

Bus_voltage_sel

0: 1.8-2.5V, 1: 3.3-5V

MCPF1412M06 Datasheet(PDF) 5 Page - Microchip Technology

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